The difference between hexagonal boron nitride and cubic boron nitride


Jul 22, 2023

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Difference between hexagonal and cubic boron Nitride Boron nitride crystals are composed of nitrogen and boron. The chemical formula is 43.6% Boron and 56.4% Nitrogen. It comes in four different forms: hexagonal (HBN), Rhombohedral, (RBN), Cubic (CBN), or wurtzite-nitrogen-boron (WBN). The cubic crystal version (another form of wurtzite in boron nitride), which is the alternate form, is regarded as the hardest substance. It is widely used for the production of alloys as well as high-temperature-resistant materials, semiconductors. nuclear reactors and lubricants.
1. Hexagonal Nitride Boron
Hexagonal boran nitride, also called “white graphene”, has a two dimensional material that is composed of monoatomic layers made up of alternating nitrogen atoms with boron. The layered structure is AA’AA ‘……type and it is similar to graphene.
Hexagonal boron nitride (H-BN) is a graphite lattice, which is in the form of a loose, lubricating, moisture-absorbing, light-weight, insoluble, high-temperature-resistant white powder. Hexagonal boran nitride is chemically resistant and has no melting point. It does not react to metals such as general metals and rare earth metals.
Hexagonal Borosilicate is a good insulator, with excellent mechanical and chemical properties. It is used for composite material modification, field emission, ultraviolet lasers, and antioxidation coatings. The layers and other aspects are important.
2. Cubic Boron Nitride
C-BN is a material that is only second to diamond in terms of hardness. It is superhard and is produced by combining hexagonal boron and a catalyst at high temperatures under high pressure.
Cubic Boron Nitride is available in amber, black and metal-plated surfaces. The particle size ranges from 1mm to less than 1mm. It is a high-quality material that has a high level of thermal stability and chemical resistance.
It is the physical properties that make the difference between hexagonal and cubic boron oxide.
Hexagonal boran nitride has a white color, whereas cubic boron is black, amber or other colors. ;
Hexagonal and cubic boron-nitride are both soft.
Hexagonal boran nitride is a raw material that can be used for the production of cubic boron oxide;
Hexagonal and cubic boron-nitride are used in the production of CBN tools.

The structure and properties hexagonal boron Nitride
The hexagonal boron-nitride crystal structure is the same as that of graphene. Multilayers are used to stack the material. Van der Waals force links the BNBs between different layers. The crystal lattice constants are a=0.2506+0.0002nm and c=0.667+0.0004nm. The density is r=2.25g/cm3.
Cubic boron-nitride has excellent stability in air. It is also very hard (Mohs Hardness 2) and has a wide bandgap. Cubic Boron Nitride can be used at temperatures as high as 2270degC, but will sublime around 3270degC. The hexagonal boron is also a very good material for insulation and chemical stability. It has low thermal expansion/shrinking rates and does not react when exposed to weak acids or strong bases.
Hexagonal Boron Nitride: Properties and Applications
The molecular characteristics of hexagonal Boron Nitride give it many excellent properties. They include excellent dielectric and thermal properties, low friction coefficients, good lubricity as well. At the same time, it also has chemical properties such as strong oxidation resistance, strong corrosion-resistance, and stable chemical properties.
(1) High heat resistant. Hexagonal Boron Nitride (h-BN), when heated at 3000 or higher in 0.1Mpa Nitrogen, will sublimate. At 1800, its strength is two times that at room temperature. This gives it excellent thermal shock resistance. It is cooled in the air to 1500. No rupture will occur at room temperature.
(2) High thermal conduction. The thermal conductivity (W/m*k) of hexagonal boran nitride materials is around 33W/m*k. It is comparable to that of stainless-steel, but the thermal conductivity in this case is greater.

(3) Low expansion coefficient. The hexagonal boron-nitride has a linear expansion coefficient (2.06.5*10-6/) that is only second to quartz glass. The material is also thermally conductive, which makes it excellent in terms of thermal shock resistance.
(4) Excellent electrical isolation. Hexagonal boran nitride is a good high temperature insulation. Its maximum volume resistivity, at high temperatures of 1000 degrees, can be as high 10161018O*cm.
(5) Good corrosion resistant. Hexagonal Borosidriad has good chemical resistance and is not affected by molten glass, metals and salts. This material is highly resistant to alkali and acid and can withstand molten glass and metals.
(6) Lower coefficient of friction. Hexagonal boran nitride is a lubricant with excellent properties. The friction coefficient is 0.16. It does not increase when heated and it has better temperature resistance than graphite or molybdenum diulfide. Up to 900degC can be achieved with the oxidizing atmosphere, while under vacuum it can reach up to 2100degC.
(7) Machinability. Hexagonal Borosilicate is easily finished using conventional metal-cutting techniques. Turning accuracy can reach up to 0.05mm. This allows for the production of complex shapes from hexagonal Borosilicate blanks.

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